JRi's SB/09 Sprint car shock was developed with track testing by top wing and non-winged sprint car drivers and teams in the United States. The development of this shock has led to a range of options being available to suit the racing series you compete in. With the widest range of adjustment available on the market, you can tune your JRi shock quickly to suit the time constrains that sprint car racing demands. Want to switch between a non-winged and a winged sprint car? Not a problem wit this shock. From a non-adjustable to triple adjustable, base valve or non-base valve, JRi Shocks has the right sprint car shock for you.